Lens, Double Concave, Spherical

Set consists of seven polished brass weights and two black enameled weights with flat countersunk bottoms. Each weight is accurately adjusted and the value clearly indicated. Individual masses are as follows: 1 x 10 gm, 2 x 20 gm, 1 x 50 gm, 1 x 100 gm, 2 x 200 gm, 1 x 500 gm, 1 x 1000 gm.